EVERYDAY SCIENCE

Detailed explanation-1: -Cockroaches have an open circulatory system. They lack blood vessels and capillaries. The blood is present in spaces called hemocoel. The visceral organs bath in the hemocoel.

Detailed explanation-2: -Open circulatory system: It is primarily found in invertebrates. Here, the blood flows freely through cavities since there are no vessels to conduct the blood. Closed circulatory system: It is found in vertebrates and a few invertebrates, like earthworms.

Detailed explanation-3: -Arthropods and most mollusks have open circulatory systems, while mammals, reptiles, amphibians, birds, and some invertebrates have closed circulatory systems.

Detailed explanation-4: -Like all arthropods, insects have an open circulatory system as opposed to our closed circulatory system. Whereas our blood is confined within blood vessels, insect blood, called hemolymph, flows freely throughout the body. Insects do, however, have a vessel along their dorsal side which moves this hemolymph.